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Question

The perimeter of the given triangle is 12 cm. Find the measure of the side AB.


A
7 cm
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B
4.5 cm
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C
4 cm
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D
6 cm
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Solution

The correct option is C 4 cm
Given:
  • AC = 5 cm and BC = 3 cm
  • Perimeter of Δ ABC = 12 cm
Let the length of the side AB = x units
Now,
Perimeter of a triangle = Sum of lengths of all the sides
12=3+5+x
x=[12(3+5)]
=(128)=4 cm
Hence, the measure of side AB=4 cm

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